used like new FITCENT Heart Rate Monitor Armband, Bluetooth ANT+ Optical Heart Rate Sensor Arm Band, Rechargeable Fitness Tracker for Peloton Strava Zwift Polar Beat DDP Yoga Wahoo Fitness. 

• 【 REAL HEART RATE TRACKING 】 FITCENT heart rate monitor armband monitors your heart rate in real-time while workout. CL830 Sensor can help you track and capture real-time heart rate, training zones and calories burned on your smartphone or tablet with compatible training apps.

• 【 BLUETOOTH & ANT+ WIRELESS TRANSMISSION 】 Dual band technology (Bluetooth / ANT+) works well with smartphones, tablets, GPS watches and bike computers by Wahoo, Polar, Garmin and more. Compatibility mobile devices: iPhone 4S and later, iPad, Android 4.3 or later.

• 【 APPS COMPATIBLE 】 Works with over 200 popular heart rate monitoring fitness apps including Wahoo Fitness, Polar Beat, Zwift, Peloton, DDP Yoga, Runtastic, Runkeeper, UA Record, Endomondo, Map My Run, Komoot and more!

• 【RECHARGEANLE LITHIUM BATTERY 】 Rechargeable lithium battery with LED charging indicator, charge the Armband Heart Rate Monitor for 1.5 hours or until solid green light indicates the unit is fully charged. The built-in lithium battery, can last up to 60 hours meet the demand of various time users.

• Note--this is not returnable. Please be sure it is right for you before buying. Thank you.